. Prognoz-6 satellite magnetometer observation database . The Prognoz-6 satellite was launched 22 September 1977 into orbit with perigee 500 km and apogee 200000 km, orbital period was 95 hours. Magnetic field measurements were conducted by SG-70 magnetometer with working range +/- 60 nT., accuracy about 0.3 nT. and sampling rate 1 measurement per 10.24 sec. Magnetic measurements and satellite position data in GSE coordinate system are presented in separate ASCII files. Magnetic data . Position data .